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Road Noise 개선을 위한 CAE 기반 DFSS Study
권우성(Woosung Kwon),유봉준(Bongjun Yoo),김병훈(Byounghoon Kim),김인동(Indong Kim) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4
In the early phase of vehicle development, CAE is conducted as tool for vehicle performance assessment. To maintain acceptable road noise performance, solution for reduced vehicle sensitivity is required. Chassis interface dynamic stiffness characteristics are key component to isolating vibration and noise of road from the vehicle interior. This research provide how to set up the optimized dynamic characteristics under noise effect through DFSS study. CAE-based DOE is performed to build prediction math model, CMS process involves DOE to achieve very fast run times while giving results very comparable. Minimized 95<SUP>th</SUP> percentile of performance distribution is applied to minimize vehicle sensitivity and road noise levels variation during the optimization process. Finally, the results of optimization were reviewed for performance and robustness.
직교배열표를 이용한 이산설계 공간에서의 Steering System 설계
권우성(Woosung Kwon),박우선(Woosun Park),김동석(Dongseok Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The design of experiment (DOE) with orthogonal arrays is adopted when the engineering design is needed in a discrete design space. In this research, a design process with orthogonal array is performed to obtain the optimum design which satisfy the frequency target of the steering system. The optimum design is determined from the analysis of means (ANOH) and sensitivity information about design variables is evaluated by the analysis of variance (ANOVA). Interactions between design variables are investigated to achieve additivity which should be valid in using orthogonal array. It is shown that when strong interactions exist, the DOE process with orthogonal array considering interaction is introduced to find out optimum design .
실험계획법을 이용한 CAE기반 Road Noise 개선 연구
권우성(Woosung Kwon),유봉준(Bongjun Yoo),김병훈(Byounghoon Kim),박광서(Kwangseo Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In the early phase of vehicle development, CAE is conducted as tool for vehicle performance assessment. To maintain acceptable road noise performance, solution for reduced vehicle sensitivity is required. Chassis interface dynamic stiffness characteristics are key component to isolating vibration and noise of road from the vehicle interior. This research provide how to set up the optimized dynamic characteristics under noise factors. CAE-based DOE is performed to build prediction math model, CMS process involves DOE to achieve very fast run times while giving results very comparable. Minimized 95<SUP>th</SUP> percentile of performance distribution is applied to minimize vehicle sensitivity and absolute road noise levels variation is during the optimization process. Finally, the results of optimization were reviewed for performance and robustness.
박광서(Kwangse Park),권우성(Woosung Kwon),김인동(Indong Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
This paper describes a procedure of transmission loss development in vehicle. Especially, this paper is focused on the transmitted noise through dash panel assembly from engine room to cabin. Included contents are the transmitted noise analysis procedure and method. Material properties of insulation, heavy layer and marble sponge were measured. Transmission loss results were obtained from analysis and measurement through dash panel from reverberating room to anechoic room. The simulation results of transmission loss data were compared with measurements data and were discussed in more detail. Finally, we dealt with a measured transmission loss data extended high frequency range and an evaluation of sound with insulation in a real vehicle.
실험계획법을 이용한 Steering Vibration 최적설계
김병훈(Byounghoon Kim),권우성(Woosung Kwon),신인섭(Inseob Shin),한우섭(Woosub Han),박광서(Kwangseo Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The Steering vibration is one of the major contributors to the perceived quality in a vehicle. Especially, the steering vibration is the important role at the idle status. So it has a lot of effort to improve the steering vibration. The Steering vibration is related to the steering column, IP Structure and BIW (body in white) structure. In this paper, Design parameters are limited to IP Structure and BIW (body in white) structure and we will find important optimization design parameters among many design parameters through DOE and Kriging method. Also, we will find the optimized shape through the shape optimization analysis to improve the steering vibration and minimize the mass increase.
차량 외부 디자인 단계에서 경차의 전면 개구부 설정을 위한 Kringing method를 통한 유입 유량과 공력 성능에 대한 연구
김용년(Yongnyun Kim),강선제(Sunje Kang),김수경(Sukyung Kim),권우성(Woosung Kwon),하종백(Jongpaek Ha) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Definition of Front End Opening is main development factor to develop vehicle exterior design and vehicle performance for Aerodynamics and powertrain cooling. This front opening definition has to be applied in early design development stage. And required opening area based on vehicle performance condition should be reflected to this definition. This opening is key factor for styling and engineering design to meet styling needs and performance requirement. In terms of vehicle performance, this opening is area to supply cooling airflow (FEAF, front end airflow) for powertrain and a factor to generate drag in engine room compartment. This study is to develop a method to optimize front end opening and to develop a prediction tool and supply a tool to design studio to meet each requirement by Kriging method that is one of DFSS tools.
유봉준(Bongjun Yoo),박광서(Kwangseo Park),이상윤(Sangyun Lee),김병훈(Byunghoon Kim),권우성(Woosung Kwon) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Fuel economy is one of the prior factors to be considered by consumers. The Lock-up clutch is one way of improving fuel economy while it has a negative effect on NVH performance. It reduces slips in torque converters of automatic transmission vehicles, connecting a crank shaft directly with a drive shaft at relatively low rpm. In the meantime the impact, mainly noise and vibration, is transmitted to passengers. This study intends to show how to lower the vibration due to the Lock-up. DOE study is used to figure out which body panel affects the A/T performance the most and the Kriging method is applied to design DOE. A/T performance for each DOE case is obtained by running FE analysis of the full vehicle model. In addition, optimization provides the combination of panel thicknesses to fulfill the minimization of the total mass of panels. Finally, the effect which the changed panel thicknesses have on the other N&V performance is reviewed.